Optical imaging lens

ABSTRACT

An optical imaging lens may include a first, a second, a third, a fourth, a fifth, a sixth, a seventh, and an eighth lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of the eight lens elements, the improved optical imaging lens may provide better imaging quality while the system length of the lens may be shortened, the F-number may be reduced, the field of view may be extended, and the image height may be increased.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to P.R.C. Patent Application No.202010824840.5 titled “Optical Imaging Lens,” filed on Aug. 17, 2020,with the State Intellectual Property Office of the People's Republic ofChina (SIPO).

TECHNICAL FIELD

The present disclosure relates to an optical imaging lens, andparticularly, to an optical imaging lens having at least eight lenselements.

BACKGROUND

Recently, optical imaging lenses continue to evolve, and the scope ofthe application is wider. In addition to requiring the lens to be thinand short, a small F-number (Fno) design is beneficial to increase theluminous flux and a large field of view has gradually become a markettrend. Moreover, in order to improve the pixel and resolution, the imageheight of the optical imaging lens must be increased, and a larger imagesensor is used to receive the imaging rays to meet the demand for highresolution. Therefore, how to design an optical imaging lens with smallF-number, large field of view, and large image height in addition topursuing a light, thin and short lens is also the focus of research anddevelopment.

SUMMARY

In view of the above-mentioned problems, in addition to the good imagingquality of the optical imaging lens, shortening the length of the lens,decreasing the F-number, expanding the field of view, and increasing theimage height are the key points of improvement of the present invention.

The present disclosure provides an optical imaging lens for capturingimages and videos such as the optical imaging lens of cell phones,cameras, tablets, and personal digital assistants. By controlling theconvex or concave shape of the surfaces of at least eight lens elements,the length of the optical imaging lens may be shortened, the F-numbermay be decreased, the field of view may be enlarged, and the imageheight may be enlarged while maintaining good optical characteristics.

In the specification, parameters used herein may include:

Param- eter Definition T1 A thickness of the first lens element alongthe optical axis G12 A distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, i.e., an air gap between the first lens element andthe second lens element along the optical axis T2 A thickness of thesecond lens element along the optical axis G23 A distance from theimage-side surface of the second lens element to the object-side surfaceof the third lens element along the optical axis, i.e., an air gapbetween the second lens element and the third lens element along theoptical axis T3 A thickness of the third lens element along the opticalaxis G34 A distance from the image-side surface of the third lenselement to the object-side surface of the fourth lens element along theoptical axis, i.e., an air gap between the third lens element and thefourth lens element along the optical axis T4 A thickness of the fourthlens element along the optical axis G45 A distance from the image-sidesurface of the fourth lens element to the object-side surface of thefifth lens element along the optical axis, i.e., an air gap between thefourth lens element and the fifth lens element along the optical axis T5A thickness of the fifth lens element along the optical axis G56 Adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis,i.e., an air gap between the fifth lens element and the sixth lenselement along the optical axis T6 A thickness of the sixth lens elementalong the optical axis G67 A distance from the image-side surface of thesixth lens element to the object-side surface of the seventh lenselement along the optical axis, i.e., an air gap between the sixth lenselement and the seventh lens element along the optical axis T7 Athickness of the seventh lens element along the optical axis G78 Adistance from the image-side surface of the seventh lens element to theobject-side surface of the eighth lens element along the optical axis,i.e., an air gap between the seventh lens element and the eighth lenselement along the optical axis T8 A thickness of the eighth lens elementalong the optical axis G8F A distance from the image-side surface of theeighth lens element to the object-side surface of the filtering unitalong the optical axis, i.e., an air gap between the eighth lens elementand the filtering unit along the optical axis TTF A thickness of thefiltering unit along the optical axis GFP An air gap between thefiltering unit and the image plane along the optical axis f1 A focallength of the first lens element f2 A focal length of the second lenselement f3 A focal length of the third lens element f4 A focal length ofthe fourth lens element f5 A focal length of the fifth lens element f6 Afocal length of the sixth lens element f7 A focal length of the seventhlens element f8 A focal length of the eighth lens element n1 Arefractive index of the first lens element n2 A refractive index of thesecond lens element n3 A refractive index of the third lens element n4 Arefractive index of the fourth lens element n5 A refractive index of thefifth lens element n6 A refractive index of the sixth lens element n7 Arefractive index of the seventh lens element n8 A refractive index ofthe eighth lens element V1 An Abbe number of the first lens element V2An Abbe number of the second lens element V3 An Abbe number of the thirdlens element V4 An Abbe number of the fourth lens element V5 An Abbenumber of the fifth lens element V6 An Abbe number of the sixth lenselement V7 An Abbe number of the seventh lens element V8 An Abbe numberof the eighth lens element HFOV Half Field of View of the opticalimaging lens Fno F-number of the optical imaging lens EFL An effectivefocal length of the optical imaging lens TTL A distance from theobject-side surface of the first lens element to the image plane alongthe optical axis, i.e., the system length of the optical imaging lensALT A sum of the thicknesses of the first lens element, the second lenselement, the third lens element, the fourth lens element, the fifth lenselement, the sixth lens element, the seventh lens element, and theeighth lens element along the optical axis AAG A sum of a distance fromthe image-side surface of the first lens element to the object-sidesurface of the second lens element along the optical axis, a distancefrom the image- side surface of the second lens element to theobject-side surface of the third lens element along the optical axis, adistance from the image-side surface of the third lens element to theobject-side surface of the fourth lens element along the optical axis, adistance from the image- side surface of the fourth lens element to theobject-side surface of the fifth lens element along the optical axis, adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis, adistance from the image-side surface of the sixth lens element to theobject-side surface of the seventh lens element along the optical axis,and a distance from the image-side surface of the seventh lens elementto the object- side surface of the eighth lens element along the opticalaxis, i.e., a sum of seven air gaps from the first lens element to theeighth lens element along the optical axis BFL A back focal length ofthe optical imaging lens, i.e., a distance from the image-side surfaceof the eighth lens element to the image plane along the optical axis(i.e. a sum of G8F, TTF, and GFP) TL A distance from the object-sidesurface of the first lens element to the image-side surface of theeighth lens element along the optical axis ImgH An image height of theoptical imaging lens Tmax A maximum lens element thickness among thefirst, second, third, fourth, fifth, sixth, seventh and eighth lenselements along the optical axis, i.e., the maximum value of T1, T2, T3,T4, T5, T6, T7, and T8 Tmax2 A second maximum lens element thicknessamong the first, second, third, fourth, fifth, sixth, seventh and eighthlens elements along the optical axis, i.e., the second maximum value ofT1, T2, T3, T4, T5, T6, T7, and T8 Tmin A minimum lens element thicknessamong the first, second, third, fourth, fifth, sixth, seventh and eighthlens elements along the optical axis, i.e., the minimum value of T1, T2,T3, T4, T5, T6, T7, and T8 Gmax A maximum air gap among the first,second, third, fourth, fifth, sixth, seventh and eighth lens elements,i.e., the maximum value of G12, G23, G34, G45, G56, G67, and G78 Gmin Aminimum air gap among the first, second, third, fourth, fifth, sixth,seventh and eighth lens elements, i.e., the minimum value of G12, G23,G34, G45, G56, G67, and G78

According to one embodiment of the optical imaging lens of the presentdisclosure, an optical imaging lens may comprise a first lens element, asecond lens element, a third lens element, a fourth lens element, afifth lens element, a sixth lens element, a seventh lens element, and aneighth lens element sequentially from an object side to an image sidealong an optical axis. The first lens element to the eighth lens elementmay each comprise an object-side surface facing toward the object sideand allowing imaging rays to pass through and an image-side surfacefacing toward the image side and allowing the imaging rays to passthrough. The third lens element may have positive refracting power. Thefifth lens element may have negative refracting power. The sixth lenselement may have positive refracting power. An optical axis region ofthe object-side surface of the seventh lens element may be concave. Lenselements included by the optical imaging lens are only the eight lenselements described above. The optical imaging lens may satisfyInequality (1): ImgH/Fno≥3.00 mm and Inequality (2):(Tmax+Tmax2)/Gmax≥1.500.

According to another embodiment of the optical imaging lens of thepresent disclosure, an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement, and an eighth lens element sequentially from an object side toan image side along an optical axis. The first lens element to theeighth lens element may each comprise an object-side surface facingtoward the object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through. A periphery region of the image-side surface ofthe first lens element may be concave. The sixth lens element may havepositive refracting power. An optical axis region of the object-sidesurface of the seventh lens element may be concave. A periphery regionof the image-side surface of the eighth lens element may be convex. Lenselements included by the optical imaging lens are only the eight lenselements described above. The optical imaging lens may satisfyInequality (1): ImgH/Fno≥3.00 mm and Inequality (2):(Tmax+Tmax2)/Gmax≥1.500.

According to another embodiment of the optical imaging lens of thepresent disclosure, an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement, and an eighth lens element sequentially from an object side toan image side along an optical axis. The first lens element to theeighth lens element may each comprise an object-side surface facingtoward the object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through. A periphery region of the image-side surface ofthe first lens element may be concave. The sixth lens element may havepositive refracting power. An optical axis region of the image-sidesurface of the seventh lens element may be convex. A periphery region ofthe object-side surface of the eighth lens element may be concave. Anoptical axis region of the image-side surface of the eighth lens elementmay be concave. Lens elements included by the optical imaging lens areonly the eight lens elements described above. The optical imaging lensmay satisfy Inequality (1): ImgH/Fno≥3.00 mm and Inequality (2′):(Tmax+Tmax2)/Gmax≥1.850.

In above three embodiments, some Inequalities could be taken intoconsideration as follows:

ImgH/AAG ≥ 2.100 Inequality (3); AAG/(Tmax + Tmin) ≥ 1.500 Inequality(4); AAG/(G23 + G56) ≥ 3.400 Inequality (5); TL/BFL ≥ 5.500 Inequality(6); TTL/(T7 + G78 + T8) ≤ 5.100 Inequality (7); ALT/(G56 + T6 + G67) ≥3.600 Inequality (8); EFL/(G34 + T4 + G45) ≤ 7.100 Inequality (9);(Gmax + Gmin)/Tmin ≤ 3.200 Inequality (10); AAG/(G67 + G78) ≤ 3.700Inequality (11); TL/(T1 + G12 + T2) ≤ 5.500 Inequality (12); TTL/(T3 +G45) ≤ 12.000 Inequality (13); ALT/(T6 + T8) ≥ 3.600 Inequality (14);(EFL + BFL)/AAG ≥ 2.900 Inequality (15); TTL/(Tmax + Gmin) ≥ 6.700Inequality (16); TL/(T3 + G34 + T4) ≥ 3.300 Inequality (17); (T7 + G78 +T8)/(G23 + T5) ≤ 2.500 Inequality (18); and (T1 + G12 + T2)/(T5 + G78) ≤2.000 Inequality (19).

Any one of the aforementioned inequalities may be selectivelyincorporated in other inequalities to apply to the present embodiments,and as such are not limiting. In some example embodiments, more detailsabout the convex or concave surface structure, refracting power orchosen material etc. could be incorporated for one specific lens elementor broadly for plural lens elements to enhance the control for thesystem performance and/or resolution. It is noted that the detailslisted here could be incorporated in example embodiments if noinconsistency occurs.

According to above illustration, the length of the optical imaging lensmay be shortened, the F-number may be decreased, the field of view maybe extended, and the image height may be enlarged while maintaining goodoptical characteristics by controlling the convex or concave shape ofthe surfaces of lens elements.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appendeddrawings, in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to one embodiment of the present disclosure;

FIG. 2 depicts a schematic view of a relation between a surface shapeand an optical focus of a lens element;

FIG. 3 depicts a schematic view of a first example of a surface shapeand an effective radius of a lens element;

FIG. 4 depicts a schematic view of a second example of a surface shapeand an effective radius of a lens element;

FIG. 5 depicts a schematic view of a third example of a surface shapeand an effective radius of a lens element;

FIG. 6 depicts a cross-sectional view of the first embodiment of anoptical imaging lens according to the present disclosure;

FIG. 7 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the first embodiment of an opticalimaging lens according to the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of anoptical imaging lens of the first embodiment of the present disclosure;

FIG. 9 depicts a table of aspherical data of the first embodiment of anoptical imaging lens according to the present disclosure;

FIG. 10 depicts a cross-sectional view of the second embodiment of anoptical imaging lens according to the present disclosure;

FIG. 11 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the second embodiment of an opticalimaging lens according to the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of anoptical imaging lens of the second embodiment of the present disclosure;

FIG. 13 depicts a table of aspherical data of the second embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 14 depicts a cross-sectional view of the third embodiment of anoptical imaging lens according to the present disclosure;

FIG. 15 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the third embodiment of an opticalimaging lens according to the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens of the third embodiment of the present disclosure;

FIG. 17 depicts a table of aspherical data of the third embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 18 depicts a cross-sectional view of the fourth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 19 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the fourth embodiment of an opticalimaging lens according to the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of anoptical imaging lens of the fourth embodiment of the present disclosure;

FIG. 21 depicts a table of aspherical data of the fourth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 22 depicts a cross-sectional view of the fifth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 23 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the fifth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens of the fifth embodiment of the present disclosure;

FIG. 25 depicts a table of aspherical data of the fifth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 26 depicts a cross-sectional view of the sixth embodiment of anoptical imaging lens elements according to the present disclosure;

FIG. 27 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the sixth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of thesixth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 29 depicts a table of aspherical data of the sixth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 30 depicts a cross-sectional view of the seventh embodiment of anoptical imaging lens elements according to the present disclosure;

FIG. 31 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the seventh embodiment of the opticalimaging lens according to the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of theseventh embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 33 depicts a table of aspherical data of the seventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 34 depicts a cross-sectional view of the eighth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 35 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the eighth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of theeighth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 37 depicts a table of aspherical data of the eighth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 38 depicts a cross-sectional view of the ninth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 39 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the ninth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 40 depicts a table of optical data for each lens element of theninth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 41 depicts a table of aspherical data of the ninth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 42 is a table for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) as determined in the first to ninth embodiments.

DETAILED DESCRIPTION

The terms “optical axis region”, “periphery region”, “concave”, and“convex” used in this specification and claims should be interpretedbased on the definition listed in the specification by the principle oflexicographer.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1, a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. If multiple transition points are present on a single surface,then these transition points are sequentially named along the radialdirection of the surface with reference numerals starting from the firsttransition point. For example, the first transition point, e.g., TP1,(closest to the optical axis I), the second transition point, e.g., TP2,(as shown in FIG. 4), and the Nth transition point (farthest from theoptical axis I).

The region of a surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest Nth transition point from the optical axis I to the opticalboundary OB of the surface of the lens element is defined as theperiphery region. In some embodiments, there may be intermediate regionspresent between the optical axis region and the periphery region, withthe number of intermediate regions depending on the number of thetransition points.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1, the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2, optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2. Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2. Accordingly, since theextension line EL of the ray intersects the optical axis I on the objectside A1 of the lens element 200, periphery region Z2 is concave. In thelens element 200 illustrated in FIG. 2, the first transition point TP1is the border of the optical axis region and the periphery region, i.e.,TP1 is the point at which the shape changes from convex to concave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius” (the “R” value), which isthe paraxial radius of shape of a lens surface in the optical axisregion. The R value is commonly used in conventional optical designsoftware such as Zemax and CodeV. The R value usually appears in thelens data sheet in the software. For an object-side surface, a positiveR value defines that the optical axis region of the object-side surfaceis convex, and a negative R value defines that the optical axis regionof the object-side surface is concave. Conversely, for an image-sidesurface, a positive R value defines that the optical axis region of theimage-side surface is concave, and a negative R value defines that theoptical axis region of the image-side surface is convex. The resultfound by using this method should be consistent with the methodutilizing intersection of the optical axis by rays/extension linesmentioned above, which determines surface shape by referring to whetherthe focal point of a collimated ray being parallel to the optical axis Iis on the object-side or the image-side of a lens element. As usedherein, the terms “a shape of a region is convex (concave),” “a regionis convex (concave),” and “a convex-(concave-) region,” can be usedalternatively.

FIG. 3, FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3, only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3, since the shape of the optical axis regionZ1 is concave, the shape of the periphery region Z2 will be convex asthe shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4, a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4, theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region between 0-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion between 50%-100% of the distance between the optical axis I andthe optical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5, the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

The optical imaging lens of the present disclosure may comprise at leasteight lens elements, in which a first lens element, a second lenselement, a third lens element, a fourth lens element, a fifth lenselement, a sixth lens element, a seventh lens element, and an eighthlens element are arranged sequentially from an object side to an imageside along an optical axis. The first lens element to the eighth lenselement may each comprise an object-side surface facing toward theobject side and allowing imaging rays to pass through and an image-sidesurface facing toward the image side and allowing the imaging rays topass through. Through designing concave and/or convex surfaces of eachlens elements described below, the optical imaging lens may provideimproved imaging quality, reduced length of the optical imaging lens,decreased F-number, extended field of view, and enlarged image height.

According to some embodiments of the present invention, increasing theluminous flux and the image height of the optical lens system whilemaintaining the imaging quality can be effectively achieved through theconcave-convex design of the following surface shape and the limitationof the refracting power of lens elements: the sixth lens element havingpositive refracting power, an optical axis region of the object-sidesurface of the seventh lens element being concave, and the opticalimaging lens satisfying Inequality (1): ImgH/Fno≥3.000 mm and Inequality(2): (Tmax+Tmax2)/Gmax≥1.500, in conjunction with (a) the third lenselement having positive refracting power and the fifth lens elementhaving negative refracting power, or (b) a periphery region of theimage-side surface of the first being concave and a periphery region ofthe image-side surface of the eighth lens element being convex. Further,a preferable range of Inequality (1) may be 3.000 mm≤ImgH/Fno≤4.200 mmand preferable range of Inequality (2) may be1.500≤(Tmax+Tmax2)/Gmax≤4.300.

According to some embodiments of the present invention, increasing theluminous flux and the image height of the optical lens system whilemaintaining the imaging quality can be effectively achieved through theconcave-convex design of the following surface shape and the limitationof the refracting power of lens elements: a periphery region of theimage-side surface of the first lens element being concave, the sixthlens element having positive refracting power, an optical axis region ofthe image-side surface of the seventh lens element being convex, aperiphery region of the object-side surface of the eighth lens elementbeing concave, an optical axis region of the image-side surface of theeighth lens element being concave, and the optical imaging lenssatisfying Inequality (1): ImgH/Fno≥3.000 mm. In addition, the chromaticaberration of the optical system may be improved when the opticalimaging lens satisfies Inequality (2′): (Tmax+Tmax2)/Gmax≥1.850.Further, a preferable range of Inequality (2′) may be1.850≤(Tmax+Tmax2)/Gmax≤4.300.

When the optical imaging lens satisfies Inequality (3), the system imageheight can be increased, and the imaging pixel and resolution can beimproved. Further, a preferable range of Inequality (3) may be2.100≤ImgH/AAG≤2.900.

According to some embodiments of the present invention, to achieve ashortened length of lens system while maintaining image quality, valuesof the air gap between lens elements or the thickness of each lenselement may be adjusted appropriately. The optical imaging lens may bedesigned to selectively satisfy inequalities (4)-(19). To consider easeof manufacturing the optical imaging lens, an optical imaging lens ofthe present disclosure may also satisfy one or more of the inequalitiesbelow:

1.500≤AAG/(Tmax+Tmin)≤2.400;

3.400≤AAG/(G23+G56)≤8.300;

5.500≤TL/BFL≤13.700;

3.900≤TTL/(T7+G78+T8)≤5.100;

3.600≤ALT/(G56+T6+G67)≤5.400;

3.600≤EFL/(G34+T4+G45)≤7.100;

1.400≤(Gmax+Gmin)/Tmin≤3.200;

1.600≤AAG/(G67+G78)≤3.700;

3.800≤TL/(T1+G12+T2)≤5.500;

5.700≤TTL/(T3+G45)≤12.000;

3.600≤ALT/(T6+T8)≤6.300;

2.900≤(EFL+BFL)/AAG≤3.700;

6.700≤TTL/(Tmax+Gmin)≤9.900;

3.300≤TL/(T3+G34+T4)≤8.200;

1.000≤(T7+G78+T8)/(G23+T5)≤2.500;

0.600≤(T1+G12+T2)/(T5+G78)≤2.000.

In addition, any combination of the embodiment parameters can beselected to increase the limitations of the optical imaging lens, so asto facilitate the design of the optical imaging lens of the samearchitecture of the present invention. In light of the unpredictabilityin an optical system, in the present disclosure, satisfying theseinequalities listed above may result in promoting the imaging quality,shortening the system length, increasing the field of view, increasingthe image height and/or increasing the yield in the assembly process.

Several exemplary embodiments and associated optical data will now beprovided to illustrate non-limiting examples of optical imaging lenssystems having good optical characteristics, extended field of view,reduced F-number, and enlarged image height.

Reference is now made to FIGS. 6-9. FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens 1 according to a firstexample embodiment. FIG. 7 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 1 according to the first example embodiment. FIG. 8illustrates an example table of optical data of each lens element of theoptical imaging lens 1 according to the first example embodiment. FIG. 9depicts an example table of aspherical data of the optical imaging lens1 according to the first example embodiment.

As shown in FIG. 6, the optical imaging lens 1 of the present embodimentmay comprise, in order from an object side A1 to an image side A2 alongan optical axis, an aperture stop STO, a first lens element L1, a secondlens element L2, a third lens element L3, a fourth lens element L4, afifth lens element L5, a sixth lens element L6, a seventh lens elementL7 and an eighth lens element L8. A filtering unit TF and an image planeIMA of an image sensor (not shown) are positioned at the image side A2of the optical imaging lens 1. Each of the first, second, third, fourth,fifth, sixth, seventh and eighth lens elements L1, L2, L3, L4, L5, L6,L7, L8 and the filtering unit TF may comprise an object-side surfaceL1A1/L2A1/L3A1/L4A1/L5A1/L6A1/L7A1/L8A1/TFA1 facing toward the objectside A1 and an image-side surfaceL1A2/L2A2/L3A2/L4A2/L5A2/L6A2/L7A2/L8A2/TFA2 facing toward the imageside A2. The example embodiment of the filtering unit TF illustrated maybe an IR cut filter (infrared cut filter) positioned between the eighthlens element L8 and the image plane IMA. The filtering unit TFselectively absorbs light passing optical imaging lens 1 that has aspecific wavelength to prevent the infrared ray in the light from beingtransmitted to the image plane and affecting the imaging quality.

Exemplary embodiments of each lens element of the optical imaging lens 1will now be described with reference to the drawings. The lens elementsL1, L2, L3, L4, L5, L6, L7, L8 of the optical imaging lens 1 may beconstructed using plastic materials in this embodiment for the purposeof lightweight product, but is not limit thereto.

An example embodiment of the first lens element L1 may have positiverefracting power. The optical axis region L1A1C and the periphery regionL1A1P of the object-side surface L1A1 of the first lens element L1 maybe convex. The optical axis region L1A2C and the periphery region L1A2Pof the image-side surface L1A2 of the first lens element L1 may beconcave.

An example embodiment of the second lens element L2 may have negativerefracting power. The optical axis region L2A1C and the periphery regionL2A1P of the object-side surface L2A1 of the second lens element L2 maybe convex. The optical axis region L2A2C and the periphery region L2A2Pof the image-side surface L2A2 of the second lens element L2 may beconcave.

An example embodiment of the third lens element L3 may have positiverefracting power. The optical axis region L3A1C of the object-sidesurface L3A1 of the third lens element L3 may be convex. The peripheryregion L3A1P of the object-side surface L3A1 of the third lens elementL3 may be concave. The optical axis region L3A2C and the peripheryregion L3A2P of the image-side surface L3A2 of the third lens element L3may be convex.

An example embodiment of the fourth lens element L4 may have negativerefracting power. The optical axis region L4A1C and the periphery regionL4A1P of the object-side surface L4A1 of the fourth lens element L4 maybe concave. The optical axis region L4A2C and the periphery region L4A2Pof the image-side surface L4A2 of the fourth lens element L4 may beconvex.

An example embodiment of the fifth lens element L5 may have negativerefracting power. The optical axis region L5A1C and the periphery regionL5A1P of the object-side surface L5A1 of the fifth lens element L5 maybe concave. The optical axis region L5A2C of the image-side surface L5A2of the fifth lens element L5 may be concave. The periphery region L5A2Pof the image-side surface L5A2 of the fifth lens element L5 may beconvex.

An example embodiment of the sixth lens element L6 may have positiverefracting power. The optical axis region L6A1C of the object-sidesurface L6A1 of the sixth lens element L6 may be convex. The peripheryregion L6A1P of the object-side surface L6A1 of the sixth lens elementL6 may be concave. The optical axis region L6A2C and the peripheryregion L6A2P of the image-side surface L6A2 of the sixth lens element L6may be convex.

An example embodiment of the seventh lens element L7 may have positiverefracting power. The optical axis region L7A1C and the periphery regionL7A1P of the object-side surface L7A1 of the seventh lens element L7 maybe concave. The optical axis region L7A2C and the periphery region L7A2Pof the image-side surface L7A2 of the seventh lens element L7 may beconvex.

An example embodiment of the eighth lens element L8 may have negativerefracting power. The optical axis region L8A1C and the periphery regionL8A1P of the object-side surface L8A1 of the eighth lens element L8 maybe concave. The optical axis region L8A2C of the image-side surface L8A2of the eighth lens element L8 may be concave. The periphery region L8A2Pof the image-side surface L8A2 of the eighth lens element L8 may beconvex.

The totaled 16 aspherical surfaces including the object-side surfaceL1A1 and the image-side surface L1A2 of the first lens element L1, theobject-side surface L2A1 and the image-side surface L2A2 of the secondlens element L2, the object-side surface L3A1 and the image-side surfaceL3A2 of the third lens element L3, the object-side surface L4A1 and theimage-side surface L4A2 of the fourth lens element L4, the object-sidesurface L5A1 and the image-side surface L5A2 of the fifth lens elementL5, the object-side surface L6A1 and the image-side surface L6A2 of thesixth lens element L6, the object-side surface L7A1 and the image-sidesurface L7A2 of the seventh lens element L7, and the object-side surfaceL8A1 and the image-side surface L8A2 of the eighth lens element L8 mayall be defined by the following aspherical formula (1):

$\begin{matrix}{{Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}} & {{formula}\mspace{14mu}(1)}\end{matrix}$

wherein,

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

R represents the radius of curvature of the surface of the lens element;Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant; and

a_(2i) represents an aspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 9.

FIG. 7(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), wherein thevertical axis of FIG. 7(a) defines the field of view. FIG. 7(b) showsthe field curvature aberration in the sagittal direction for threerepresentative wavelengths, wherein the vertical axis of FIG. 7(b)defines the image height. FIG. 7(c) shows the field curvature aberrationin the tangential direction for three representative wavelengths,wherein the vertical axis of FIG. 7(c) defines the image height. FIG.7(d) shows a variation of the distortion aberration, wherein thevertical axis of FIG. 7(d) defines the image height. The three curveswith different wavelengths may represent that off-axis light withrespect to these wavelengths may be focused around an image point. Fromthe vertical deviation of each curve shown in FIG. 7(a), the offset ofthe off-axis light relative to the image point may be within ±0.05 mm.Therefore, the first embodiment may improve the longitudinal sphericalaberration with respect to different wavelengths. Referring to FIG.7(b), the focus variation with respect to the three differentwavelengths in the whole field may fall within ±0.06 mm. Referring toFIG. 7(c), and the focus variation with respect to the three differentwavelengths in the whole field may fall within ±0.18 m Referring to FIG.7(d), the horizontal axis of FIG. 7(d), the variation of the distortionaberration may be within ±6%.

As shown in FIG. 8, the distance from the object-side surface L1A1 ofthe first lens element L1 to the image plane IMA along the optical axis(TTL) may be 7.715 mm, Fno may be 1.700, HFOV may be 42.686 degrees, thesystem effective length (EFL) may be 5.702 mm, and the image height(ImgH) may be 5.280 mm. In conjunction with values of aberrations inFIG. 7, the present embodiment may provide an optical imaging lens 1having a reduced volume and an extended field of view while improvingoptical performance.

Please refer to FIG. 42 for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) of the present embodiment.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 according to a secondexample embodiment. FIG. 11 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 2 according to the second example embodiment. FIG.12 shows an example table of optical data of each lens element of theoptical imaging lens 2 according to the second example embodiment. FIG.13 shows an example table of aspherical data of the optical imaging lens2 according to the second example embodiment.

As shown in FIG. 10, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures of the lenselements, including the object-side surfaces L1A1, L2A1, L3A1, L6A1,L7A1, and L8A1 and the image-side surfaces L1A2, L2A2, L3A2, L5A2, L6A2,L7A2, and L8A2, and the refracting powers of the lens elements of thepresent embodiment may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 2 may include refracting powers of the first lenselement L1 and the second lens element L2, the concave or convex surfacestructures of the object-side surfaces L4A1, L5A1 and the image-sidesurface L4A2. Additional differences may include a radius of curvature,a thickness, aspherical data, and/or an effective focal length of eachlens element. More specifically, the first lens element L1 may havenegative refracting power, the second lens element L2 may have positiverefracting power, the optical axis region L4A1C of the object-sidesurface L4A1 of the fourth lens element L4 may be convex, the opticalaxis region L4A2C of the image-side surface L4A2 of the fourth lenselement L4 may be concave, and the periphery region L5A1P of theobject-side surface L5A1 of the fifth lens element L5 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 12 for the opticalcharacteristics of each lens element in the optical imaging lens 2 ofthe present embodiment.

FIG. 11(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), the offset of theoff-axis light relative to the image point may be within ±0.18 mm.Referring to FIG. 11(b), and the focus variation with respect to thethree different wavelengths in the whole field may fall within ±0.18 mm.Referring to FIG. 11(c), the focus variation with respect to the threedifferent wavelengths in the whole field may fall within ±0.20 mm.Referring to FIG. 11(d), the variation of the distortion aberration ofthe optical imaging lens 2 may be within ±3%.

As shown in FIG. 11 and FIG. 12, in comparison with the firstembodiment, the distortion aberration in the second embodiment may besmaller, and the field of view and the image height in the secondembodiment may be larger.

Please refer to FIG. 42 for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) of the present embodiment.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 according to a thirdexample embodiment. FIG. 15 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 3 according to the third example embodiment. FIG.16 shows an example table of optical data of each lens element of theoptical imaging lens 3 according to the third example embodiment. FIG.13 shows an example table of aspherical data of the optical imaging lens3 according to the third example embodiment.

As shown in FIG. 14, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures of the lenselements, including the object-side surfaces L1A1, L2A1, L3A1, L4A1,L5A1, L6A1, and L7A1 and the image-side surfaces L1A2, L2A2, L5A2, L6A2,L7A2, and L8A2, and the refracting powers of the lens elements of thepresent embodiment may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 3 may include the refracting powers of the fourthlens element L4, the seventh lens element L7 and the eighth lens elementL8, the concave or convex surface structures of the object-side surfacesL4A1, L5A1, and L8A1 and the image-side surfaces L3A2, and L4A2.Additional differences may include a radius of curvature, a thickness,aspherical data, and/or an effective focal length of each lens element.More specifically, the fourth lens element L4 may have positiverefracting power, the seventh lens element L7 may have negativerefracting power, the eighth lens element L8 may have positiverefracting power, the optical axis region L3A2C of the image-sidesurfaces L3A2 of the third lens element L3 may be concave, the opticalaxis region L4A1C of the object-side surface L4A1 of the fourth lenselement L4 may be convex, the optical axis region L4A2C of theimage-side surface L4A2 of the fourth lens element L4 may be concave,the optical axis region L5A1C of the object-side surface L5A1 of thefifth lens element L5 may be convex, the optical axis region L8A1C ofthe object-side surface and L8A1 of the eighth lens element L8 may beconvex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 16 for the opticalcharacteristics of each lens element in the optical imaging lens 3 ofthe present embodiment.

FIG. 15(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), the offset of theoff-axis light relative to the image point may be within ±0.09 mm.Referring to FIG. 15(b), and the focus variation with respect to thethree different wavelengths in the whole field may fall within ±6 mm.Referring to FIG. 15(c), the focus variation with respect to the threedifferent wavelengths in the whole field may fall within ±6 mm.Referring to FIG. 15(d), the variation of the distortion aberration ofthe optical imaging lens 3 may be within ±60%.

As shown in FIG. 15 and FIG. 16, in comparison with the firstembodiment, the field of view and the image height in the thirdembodiment may be larger.

Please refer to FIG. 42 for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) of the present embodiment.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 according to a fourthexample embodiment. FIG. 19 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 4 according to the fourth example embodiment. FIG.20 shows an example table of optical data of each lens element of theoptical imaging lens 4 according to the fourth example embodiment. FIG.21 shows an example table of aspherical data of the optical imaging lens4 according to the fourth example embodiment.

As shown in FIG. 18, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures of the lenselements, including the object-side surfaces UAL L2A1, L3A1, L4A1, L6A1,L7A1, and L8A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L6A2,and L8A2, and the refracting powers of the lens elements of the presentembodiment may be generally similar to the optical imaging lens 1, butthe differences between the optical imaging lens 1 and the opticalimaging lens 4 may include the concave or convex surface structures ofthe object-side surface L5A1 and the image-side surfaces L4A2 and L7A2.Additional differences may include a radius of curvature, a thickness,aspherical data, and/or an effective focal length of each lens element.More specifically, the optical axis region L4A2C of the image-sidesurfaces L4A2 of the fourth lens element L4 may be concave, theperiphery region L5A1P of the object-side surface L5A1 of the fifth lenselement L5 may be convex, and the periphery region L7A2P of image-sidesurfaces L7A2 of the seventh lens element L7 may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 20 for the opticalcharacteristics of each lens element in the optical imaging lens 4 ofthe present embodiment.

FIG. 19(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), the offset of theoff-axis light relative to the image point may be within ±0.04 mm.Referring to FIG. 19(b), and the focus variation with respect to thethree different wavelengths in the whole field may fall within ±0.04 mm.Referring to FIG. 19(c), the focus variation with respect to the threedifferent wavelengths in the whole field may fall within ±0.1 mm.Referring to FIG. 19(d), the variation of the distortion aberration ofthe optical imaging lens 4 may be within ±4%.

As shown in FIG. 19 and FIG. 20, in comparison with the firstembodiment, the longitudinal spherical aberration, the field curvatureaberration in the sagittal direction, the field curvature aberration inthe tangential direction, and the distortion aberration of the opticalimaging lens 4 may be smaller, and the field of view and the imageheight in the fourth embodiment may be larger.

Please refer to FIG. 42 for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) of the present embodiment.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 according to a fifthexample embodiment. FIG. 23 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 5 according to the fifth example embodiment. FIG.24 shows an example table of optical data of each lens element of theoptical imaging lens 5 according to the fifth example embodiment. FIG.25 shows an example table of aspherical data of the optical imaging lens5 according to the fifth example embodiment.

As shown in FIG. 22 the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures of the lenselements, including the object-side surfaces UAL L2A1, L3A1, L4A1, L6A1,L7A1, and L8A1 and the image-side surfaces L1A2, L2A2, L3A2, L5A2, L6A2,L7A2, and L8A2, and the refracting powers of the lens elements of thepresent embodiment may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 5 may include the concave or convex surfacestructures of the object-side surface L5A1 and the image-side surfaceL4A2. Additional differences may include a radius of curvature, athickness, aspherical data, and/or an effective focal length of eachlens element. More specifically, the optical axis region L4A2C of theimage-side surface L4A2 of the fourth lens element L4 may be concave,and the periphery region L5A1P of the object-side surface L5A1 of thefifth lens element L5 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 24 for the opticalcharacteristics of each lens element in the optical imaging lens 5 ofthe present embodiment.

FIG. 23(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), the offset of theoff-axis light relative to the image point may be within ±0.04 mm.Referring to FIG. 23(b), and the focus variation with respect to thethree different wavelengths in the whole field may fall within ±0.04 mm.Referring to FIG. 23(c), the focus variation with respect to the threedifferent wavelengths in the whole field may fall within ±0.14 mm.Referring to FIG. 23(d), the variation of the distortion aberration ofthe optical imaging lens 5 may be within ±6%.

As shown in FIG. 23 and FIG. 24, in comparison with the firstembodiment, the longitudinal spherical aberration, the field curvatureaberration in the sagittal direction, and the field curvature aberrationin the tangential direction of the fifth embodiment may be smaller, andthe field of view and the image height in the fifth embodiment may belarger.

Please refer to FIG. 42 for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) of the present embodiment.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 according to a sixthexample embodiment. FIG. 27 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 6 according to the sixth example embodiment. FIG.28 shows an example table of optical data of each lens element of theoptical imaging lens 6 according to the sixth example embodiment. FIG.29 shows an example table of aspherical data of the optical imaging lens6 according to the sixth example embodiment.

As shown in FIG. 26 the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures of the lenselements, including the object-side surfaces UAL L2A1, L3A1, L4A1, L5A1,L6A1, L7A1, and L8A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2,L5A2, L6A2, L7A2, and L8A2, and the refracting powers of the lenselements of the present embodiment may be generally similar to theoptical imaging lens 1. Additional differences may include a radius ofcurvature, a thickness, aspherical data, and/or an effective focallength of each lens element.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 28 for the opticalcharacteristics of each lens element in the optical imaging lens 6 ofthe present embodiment.

FIG. 27(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), the offset of theoff-axis light relative to the image point may be within ±0.035 mm.Referring to FIG. 27(b), and the focus variation with respect to thethree different wavelengths in the whole field may fall within ±10 mm.Referring to FIG. 27(c), the focus variation with respect to the threedifferent wavelengths in the whole field may fall within ±25 mm.Referring to FIG. 27(d), the variation of the distortion aberration ofthe optical imaging lens 6 may be within ±40%.

As shown in FIG. 27 and FIG. 28, in comparison with the firstembodiment, the longitudinal spherical aberration of the sixthembodiment may be smaller, and the image height of the sixth embodimentmay be larger.

Please refer to FIG. 42 for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) of the present embodiment.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 according to a seventhexample embodiment. FIG. 31 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 7 according to the seventh example embodiment. FIG.32 shows an example table of optical data of each lens element of theoptical imaging lens 7 according to the seventh example embodiment. FIG.33 shows an example table of aspherical data of the optical imaging lens7 according to the seventh example embodiment.

As shown in FIG. 30 the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures of the lenselements, including the object-side surfaces L1A1, L2A1, L3A1, L5A1,L6A1, L7A1, and L8A1 and the image-side surfaces L1A2, L2A2, L3A2, L5A2,L6A2, L7A2, and L8A2, and the refracting powers of the lens elements ofthe present embodiment may be generally similar to the optical imaginglens 1, but the differences between the optical imaging lens 1 and theoptical imaging lens 7 may include the concave or convex surfacestructures of the object-side surface L4A1 and the image-side surfaceL4A2. Additional differences may include a radius of curvature, athickness, aspherical data, and/or an effective focal length of eachlens element. More specifically, the optical axis region L4A1C of theobject-side surface L4A1 of the fourth lens element L4 may be convex,and the optical axis region L4A2C of the image-side surface L4A2 of thefourth lens element L4 may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 32 for the opticalcharacteristics of each lens element in the optical imaging lens 7 ofthe present embodiment.

FIG. 31(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), the offset of theoff-axis light relative to the image point may be within ±0.08 mm.Referring to FIG. 31(b), and the focus variation with respect to thethree different wavelengths in the whole field may fall within ±0.04 mm.Referring to FIG. 31(c), the focus variation with respect to the threedifferent wavelengths in the whole field may fall within ±0.16 mm.Referring to FIG. 31(d), the variation of the distortion aberration ofthe optical imaging lens 7 may be within ±6%.

As shown in FIG. 31 and FIG. 32, in comparison with the firstembodiment, the field curvature aberration in the sagittal direction,the field curvature aberration in the tangential direction, and thedistortion aberration of the seventh embodiment may be smaller, and thefield of view and the image height of the seventh embodiment may belarger.

Please refer to FIG. 42 for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) of the present embodiment.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 according to an eighthexample embodiment. FIG. 35 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 8 according to the eighth example embodiment. FIG.36 shows an example table of optical data of each lens element of theoptical imaging lens 8 according to the eighth example embodiment. FIG.37 shows an example table of aspherical data of the optical imaging lens8 according to the eighth example embodiment.

As shown in FIG. 34 the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures of the lenselements, including the object-side surfaces L1A1, L2A1, L3A1, L4A1,L6A1, L7A1, and L8A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2,L6A2, L7A2, and L8A2, and the refracting powers of the lens elements ofthe present embodiment may be generally similar to the optical imaginglens 1, but the differences between the optical imaging lens 1 and theoptical imaging lens 8 may include the concave or convex surfacestructures of the object-side surface L5A1 and the image-side surfaceL5A2, and the refracting power of the fourth lens element L4. Additionaldifferences may include a radius of curvature, a thickness, asphericaldata, and/or an effective focal length of each lens element. Morespecifically, the periphery region L5A1P of the object-side surface L5A1of the fifth lens element L5 may be convex, the periphery region L5A2Pof the image-side surface L5A2 may be convex, and the fourth lenselement L4 may have positive refracting power.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 36 for the opticalcharacteristics of each lens element in the optical imaging lens 8 ofthe present embodiment.

FIG. 35(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), the offset of theoff-axis light relative to the image point may be within ±0.06 mm.Referring to FIG. 35(b), and the focus variation with respect to thethree different wavelengths in the whole field may fall within ±0.06 mm.Referring to FIG. 35(c), the focus variation with respect to the threedifferent wavelengths in the whole field may fall within ±0.14 mm.Referring to FIG. 35(d), the variation of the distortion aberration ofthe optical imaging lens 8 may be within ±4%.

As shown in FIG. 35 and FIG. 36, in comparison with the firstembodiment, the field curvature aberration in the tangential direction,and the distortion aberration of the eighth embodiment may be smaller,and the field of view and the image height of the optical imaging lens 8may be larger.

Please refer to FIG. 42 for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) of the present embodiment.

Reference is now made to FIGS. 38-41. FIG. 38 illustrates an examplecross-sectional view of an optical imaging lens 9 according to a ninthexample embodiment. FIG. 39 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 9 according to the ninth example embodiment. FIG.40 shows an example table of optical data of each lens element of theoptical imaging lens 9 according to the ninth example embodiment. FIG.41 shows an example table of aspherical data of the optical imaging lens9 according to the ninth example embodiment.

As shown in FIG. 38 the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures of the lenselements, including the object-side surfaces L1A1, L2A1, L3A1, L4A1,L6A1, L7A1, and L8A1 and the image-side surfaces L1A2, L2A2, L3A2, L5A2,L6A2, L7A2, and L8A2, and the refracting powers of the lens elements ofthe present embodiment may be generally similar to the optical imaginglens 1, but the differences between the optical imaging lens 1 and theoptical imaging lens 9 may include the concave or convex surfacestructures of the object-side surface L5A1 and the image-side surfaceL4A2. Additional differences may include a radius of curvature, athickness, aspherical data, and/or an effective focal length of eachlens element. More specifically, the optical axis region L4A2C of theimage-side surface L4A2 of the fourth lens element L4 may be concave,and the periphery region L5A1P of the object-side surface L5A1 of thefifth lens element L5 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 40 for the opticalcharacteristics of each lens element in the optical imaging lens 9 ofthe present embodiment.

FIG. 39(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), the offset of theoff-axis light relative to the image point may be within ±0.025 mm.Referring to FIG. 39(b), and the focus variation with respect to thethree different wavelengths in the whole field may fall within ±0.04 mm.Referring to FIG. 39(c), the focus variation with respect to the threedifferent wavelengths in the whole field may fall within ±0.14 mm.Referring to FIG. 39(d), the variation of the distortion aberration ofthe optical imaging lens 9 may be within ±2.5%.

As shown in FIG. 39 and FIG. 40, in comparison with the firstembodiment, the longitudinal spherical aberration, the field curvatureaberration in the sagittal direction, the field curvature aberration inthe tangential direction, and the distortion aberration of the ninthembodiment may be smaller, and the field of view and the image height ofthe ninth embodiment may be larger.

Please refer to FIG. 42 for the values of ImgH/Fno, (Tmax+Tmax2)/Gmax,AAG/(Tmax+Tmin), AAG/(G23+G56), TL/BFL, TTL/(T7+G78+T8),ALT/(G56+T6+G67), EFL/(G34+T4+G45), (Gmax+Gmin)/Tmin, AAG/(G67+G78),TL/(T1+G12+T2), TTL/(T3+G45), ALT/(T6+T8), (EFL+BFL)/AAG,TTL/(Tmax+Gmin), ImgH/AAG, TL/(T3+G34+T4), (T7+G78+T8)/(G23+T5), and(T1+G12+T2)/(T5+G78) of the present embodiment.

The optical imaging lens in each embodiment of the present disclosurewith the arrangements of the convex or concave surface structuresdescribed below may advantageously increase the field of view and theimage height, decrease the system length of the optical imaging lens andmaintain good optical characteristics: the third lens element havingpositive refracting power, the fifth lens element having negativerefracting power, the sixth lens element having positive refractingpower, an optical axis region of the object-side surface of the seventhlens element being concave; alternatively, a periphery region ofimage-side surface of the first lens element being concave, the sixthlens element having positive refracting power, an optical axis region ofthe object-side surface of the seventh lens element being concave, aperiphery region of the image-side surface of the eighth lens elementbeing convex; alternatively, a periphery region of the image-sidesurface of the first lens element being concave, the sixth lens elementhaving positive refracting power, an optical axis region of theimage-side surface of the seventh lens element being convex, a peripheryregion of the object-side surface of the eighth lens element beingconcave, and an optical axis region of the image-side surface of theeighth lens element being concave. The above three combinations mayadvantageously correct longitudinal spherical aberrations and fieldcurvature aberration, and reduce the distortion aberration.

A numerical range including maximum and minimum values that is obtainedbased on combination and proportional relationships of the opticalparameters disclosed in the embodiments of the disclosure may beimplemented according thereto.

According to above disclosure, the longitudinal spherical aberration,the field curvature aberration and the variation of the distortionaberration of each embodiment may meet the use requirements of variouselectronic products which implement an optical imaging lens. Moreover,the off-axis light with respect to three representative wavelengths maybe focused around an image point, and the offset of the off-axis lightfor each curve relative to the image point may be controlled toeffectively inhibit the longitudinal spherical aberration, the fieldcurvature aberration and/or the variation of the distortion aberration.Further, as shown by the imaging quality data provided for eachembodiment, the distance between the three representative wavelengthsmay indicate that focusing ability and inhibiting ability for dispersionmay be provided for different wavelengths.

In consideration of the non-predictability of the optical lens assembly,while the optical lens assembly may satisfy any one of inequalitiesdescribed above, the optical lens assembly herein according to thedisclosure may achieve a shortened length and smaller sphericalaberration, field curvature aberration, and/or distortion aberration,provide an enlarged field of view, increase an imaging quality and/orassembly yield, and/or effectively improve drawbacks of a typicaloptical lens assembly.

While various embodiments in accordance with the disclosed principlesare described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements having anobject-side surface facing toward the object side and allowing imagingrays to pass through as well as an image-side surface facing toward theimage side and allowing the imaging rays to pass through, wherein: thethird lens element has positive refracting power; the fifth lens elementhas negative refracting power; the sixth lens element has positiverefracting power; an optical axis region of the object-side surface ofthe seventh lens element is concave; lens elements included by theoptical imaging lens are only the eight lens elements described above;an image height of the optical imaging height is represented by ImgH; aF-number of the optical imaging height is represented by Fno; a maximumlens element thickness among the first, second, third, fourth, fifth,sixth, seventh and eighth lens elements along the optical axis isrepresented by Tmax; a second maximum lens element thickness among thefirst, second, third, fourth, fifth, sixth, seventh and eighth lenselements along the optical axis is represented by Tmax2; a maximum airgap among the first, second, third, fourth, fifth, sixth, seventh andeighth lens elements is represented by Gmax; and the optical imaginglens satisfies Inequality: ImgH/Fno≥3.00 mm and Inequality:(Tmax+Tmax2)/Gmax≥1.500.
 2. The optical imaging lens according to claim1, wherein, a sum of a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis, a distance from the image-side surface of the fourthlens element to the object-side surface of the fifth lens element alongthe optical axis, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis, a distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis, and a distance from the image-side surface ofthe seventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by AAG, a minimum lenselement thickness among the first, second, third, fourth, fifth, sixth,seventh and eighth lens elements along the optical axis is representedby Tmin, and the optical imaging lens further satisfies an inequality:AAG/(Tmax+Tmin)≥1.500.
 3. The optical imaging lens according to claim 1,wherein a sum of a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis, a distance from the image-side surface of the fourthlens element to the object-side surface of the fifth lens element alongthe optical axis, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis, a distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis, and a distance from the image-side surface ofthe seventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by AAG, a distance fromthe image-side surface of the second lens element to the object-sidesurface of the third lens element along the optical axis is representedby G23, a distance from the image-side surface of the fifth lens elementto the object-side surface of the sixth lens element along the opticalaxis is represented by G56, and the optical imaging lens furthersatisfies an inequality: AAG/(G23+G56)≥3.400.
 4. The optical imaginglens according to claim 1, wherein a distance from the image-sidesurface of the eighth lens element to an image plane along the opticalaxis is represented by BFL, a distance from the object-side surface ofthe first lens element to the image-side surface of the eighth lenselement along the optical axis is represented by TL, and the opticalimaging lens further satisfies an inequality: TL/BFL≥5.500.
 5. Theoptical imaging lens according to claim 1, wherein a distance from theobject-side surface of the first lens element to an image plane alongthe optical axis is represented by TTL, a distance from the image-sidesurface of the seventh lens element to the object-side surface of theeighth lens element along the optical axis is represented by G78, athickness of the seventh lens element along the optical axis isrepresented by T7, a thickness of the eighth lens element along theoptical axis is represented by T8, and the optical imaging lens furthersatisfies an inequality: TTL/(T7+G78+T8)≥5.100.
 6. The optical imaginglens according to claim 1, wherein a sum of the thicknesses of the firstlens element, the second lens element, the third lens element, thefourth lens element, the fifth lens element, the sixth lens element, theseventh lens element, and the eighth lens element along the optical axisis represented by ALT, a distance from the image-side surface of thefifth lens element to the object-side surface of the sixth lens elementalong the optical axis is represented by G56, a thickness of the sixthlens element along the optical axis is represented by T6, a distancefrom the image-side surface of the sixth lens element to the object-sidesurface of the seventh lens element along the optical axis isrepresented by G67, and the optical imaging lens further satisfies aninequality: ALT/(G56+T6+G67)≥3.600.
 7. The optical imaging lensaccording to claim 1, wherein an effective focal length of the opticalimaging lens is represented by EFL, a thickness of the fourth lenselement along the optical axis is represented by T4, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis is represented by G34,a distance from the image-side surface of the fourth lens element to theobject-side surface of the fifth lens element along the optical axis isrepresented by G45,, and the optical imaging lens further satisfies aninequality: EFL/(G34+T4+G45)≥7.100.
 8. An optical imaging lenscomprising a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element, a sixth lenselement, a seventh lens element and an eighth lens element sequentiallyfrom an object side to an image side along an optical axis, each of thefirst, second, third, fourth, fifth, sixth, seventh and eighth lenselements having an object-side surface facing toward the object side andallowing imaging rays to pass through as well as an image-side surfacefacing toward the image side and allowing the imaging rays to passthrough, wherein: a periphery region of the image-side surface of thefirst lens element is concave; the sixth lens element has positiverefracting power; an optical axis region of the object-side surface ofthe seventh lens element is concave; a periphery region of theimage-side surface of the eighth lens element is convex; lens elementsincluded by the optical imaging lens are only the eight lens elementsdescribed above; an image height of the optical imaging height isrepresented by ImgH; a F-number of the optical imaging height isrepresented by Fno; a maximum lens element thickness among the first,second, third, fourth, fifth, sixth, seventh and eighth lens elementsalong the optical axis is represented by Tmax; a second maximum lenselement thickness among the first, second, third, fourth, fifth, sixth,seventh and eighth lens elements along the optical axis is representedby Tmax2; a maximum air gap among the first, second, third, fourth,fifth, sixth, seventh and eighth lens elements is represented by Gmax;and the optical imaging lens satisfies Inequality: ImgH/Fno≥3.00 mm andInequality: (Tmax+Tmax2)/Gmax≥1.500.
 9. The optical imaging lensaccording to claim 8, wherein a minimum lens element thickness among thefirst, second, third, fourth, fifth, sixth, seventh and eighth lenselements along the optical axis is represented by Tmin, a minimum airgap among the first, second, third, fourth, fifth, sixth, seventh andeighth lens elements is represented by Gmin, and the optical imaginglens further satisfies an inequality: (Gmax+Gmin)/Tmin≥3.200.
 10. Theoptical imaging lens according to claim 8, wherein a sum of a distancefrom the image-side surface of the first lens element to the object-sidesurface of the second lens element along the optical axis, a distancefrom the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis, adistance from the image-side surface of the third lens element to theobject-side surface of the fourth lens element along the optical axis, adistance from the image-side surface of the fourth lens element to theobject-side surface of the fifth lens element along the optical axis, adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis, adistance from the image-side surface of the sixth lens element to theobject-side surface of the seventh lens element along the optical axis,and a distance from the image-side surface of the seventh lens elementto the object-side surface of the eighth lens element along the opticalaxis is represented by AAG, a distance from the image-side surface ofthe sixth lens element to the object-side surface of the seventh lenselement along the optical axis is represented by G67, a distance fromthe image-side surface of the seventh lens element to the object-sidesurface of the eighth lens element along the optical axis is representedby G78, and the optical imaging lens further satisfies an inequality:AAG/(G67+G78)≥3.700.
 11. The optical imaging lens according to claim 8,wherein a distance from the object-side surface of the first lenselement to the image-side surface of the eighth lens element along theoptical axis is represented by TL, a distance from the image-sidesurface of the first lens element to the object-side surface of thesecond lens element along the optical axis is represented by G12, athickness of the first lens element along the optical axis isrepresented by T1, a thickness of the second lens element along theoptical axis is represented by T2, and the optical imaging lens furthersatisfies an inequality: TL/(T1+G12+T2)≥5.500.
 12. The optical imaginglens according to claim 8, wherein a distance from the object-sidesurface of the first lens element to an image plane along the opticalaxis is represented by TTL, a thickness of the third lens element alongthe optical axis is represented by T3, a distance from the image-sidesurface of the fourth lens element to the object-side surface of thefifth lens element along the optical axis is represented by G45, and theoptical imaging lens further satisfies an inequality:TTL/(T3+G45)≥12.000.
 13. The optical imaging lens according to claim 8,wherein a sum of the thicknesses of the first lens element, the secondlens element, the third lens element, the fourth lens element, the fifthlens element, the sixth lens element, the seventh lens element, and theeighth lens element along the optical axis is represented by ALT, athickness of the sixth lens element along the optical axis isrepresented by T6, a thickness of the eighth lens element along theoptical axis is represented by T8, and the optical imaging lens furthersatisfies an inequality: ALT/(T6+T8)≥3.600.
 14. The optical imaging lensaccording to claim 8, wherein an effective focal length of the opticalimaging lens is represented by EFL, a distance from the image-sidesurface of the eighth lens element to an image plane along the opticalaxis is represented by BFL, a sum of a distance from the image-sidesurface of the first lens element to the object-side surface of thesecond lens element along the optical axis, a distance from theimage-side surface of the second lens element to the object-side surfaceof the third lens element along the optical axis, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis, a distance from theimage-side surface of the fourth lens element to the object-side surfaceof the fifth lens element along the optical axis, a distance from theimage-side surface of the fifth lens element to the object-side surfaceof the sixth lens element along the optical axis, a distance from theimage-side surface of the sixth lens element to the object-side surfaceof the seventh lens element along the optical axis, and a distance fromthe image-side surface of the seventh lens element to the object-sidesurface of the eighth lens element along the optical axis is representedby AAG, and the optical imaging lens further satisfies an inequality:(EFL+BFL)/AAG≥2.900.
 15. An optical imaging lens comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements having anobject-side surface facing toward the object side and allowing imagingrays to pass through as well as an image-side surface facing toward theimage side and allowing the imaging rays to pass through, wherein: aperiphery region of the image-side surface of the first lens element isconcave; the sixth lens element has positive refracting power; anoptical axis region of the image-side surface of the seventh lenselement is convex; a periphery region of the object-side surface of theeighth lens element is concave; an optical axis region of the image-sidesurface of the eighth lens element is concave; lens elements included bythe optical imaging lens are only the eight lens elements describedabove; an image height of the optical imaging height is represented byImgH; a F-number of the optical imaging height is represented by Fno; amaximum lens element thickness among the first, second, third, fourth,fifth, sixth, seventh and eighth lens elements along the optical axis isrepresented by Tmax; a second maximum lens element thickness among thefirst, second, third, fourth, fifth, sixth, seventh and eighth lenselements along the optical axis is represented by Tmax2; a maximum airgap among the first, second, third, fourth, fifth, sixth, seventh andeighth lens elements is represented by Gmax; and the optical imaginglens satisfies Inequality: ImgH/Fno≥3.00 mm and Inequality:(Tmax+Tmax2)/Gmax≥1.850.
 16. The optical imaging lens according to claim15, wherein a minimum air gap among the first, second, third, fourth,fifth, sixth, seventh and eighth lens elements is represented by Gmin, adistance from the object-side surface of the first lens element to animage plane along the optical axis is represented by TTL, and theoptical imaging lens further satisfies an inequality:TTL/(Tmax+Gmin)≥6.700.
 17. The optical imaging lens according to claim15, wherein a sum of a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis, a distance from the image-side surface of the fourthlens element to the object-side surface of the fifth lens element alongthe optical axis, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis, a distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis, and a distance from the image-side surface ofthe seventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by AAG, and the opticalimaging lens further satisfies an inequality: ImgH/AAG≥2.100.
 18. Theoptical imaging lens according to claim 15, wherein a distance from theobject-side surface of the first lens element to the image-side surfaceof the eighth lens element along the optical axis is represented by TL,a thickness of the third lens element along the optical axis isrepresented by T3, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis is represented by G34, a thickness of the fourth lenselement along the optical axis is represented by T4, and the opticalimaging lens further satisfies an inequality: TL/(T3+G34+T4)≥3.300. 19.The optical imaging lens according to claim 15, wherein a thickness ofthe fifth lens element along the optical axis is represented by T5, athickness of the seventh lens element along the optical axis isrepresented by T7, a thickness of the eighth lens element along theoptical axis is represented by T8, a distance from the image-sidesurface of the second lens element to the object-side surface of thethird lens element along the optical axis is represented by G23, adistance from the image-side surface of the seventh lens element to theobject-side surface of the eighth lens element along the optical axis isrepresented by G78, and the optical imaging lens further satisfies aninequality: (T7+G78+T8)/(G23+T5)≥2.500.
 20. The optical imaging lensaccording to claim 15, a thickness of the first lens element along theoptical axis is represented by T1, a thickness of the second lenselement along the optical axis is represented by T2, a thickness of thefifth lens element along the optical axis is represented by T5, adistance from the image-side surface of the first lens element to theobject-side surface of the second lens element along the optical axis isrepresented by G12, a distance from the image-side surface of theseventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by G78, and the opticalimaging lens further satisfies an inequality:(T1+G12+T2)/(T5+G78)≥2.000.